10 CMS detector Took ~2000 scientists and engineers more than 20 years to design and build Is about 15 metres wide and 21.5 metres long Weighs twice as much as the Eiffel Tower about 14000t Uses the largest, most powerful magnet of its kind ever made 10/33

21 ARC CE and data handling Data are moved by the users and/or by the ARC Frequently used files are cached at the execution sites Cached files are indexed 21/33

22 ARC CE internals All services are only in the frontend Grid users are mapped to local identities Use /tmp/user for files witch are actively used 22/33

23 ARC UI data manipulation arcls to list contents and view some attributes of objects of a specified (by a URL) remote directory arccp a tool to copy files over the Grid arcrm allows users to erase files and directories at any location specified by a valid URL arcmkdir allows users to create directories, if the protocol of the specified URL supports it 23/33

27 GridFTP The GSIFTP protocol offers the functionalities of FTP, but with support for GSI. Supported by all VOs in Gird arccp gsiftp://lscf.nbi.dk:2811/jobs/ /jo b.out job.out

28 File Catalogue (LFC) Users and applications need to locate files (or replicas) on the Grid. The File Catalogue is the service which maintains mappings between LFN(s), GUID and SURL(s). lfc://lfc.balticgrid.org/grid/balticgrid/bgcc2013/lab4/p 4_data.test Lfc:P4_data.test

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